Hi experts !
I have chosen self drive car as my final year project. In this project i will take video from front end camera, process it using Resberry pi (mean lane detection) and then drive the motors to steers the car . But I am little bit confused. How i will give the signal to motors from resberry pi after image prpcessing.? Please guide me . Thank you so much

let suppose i have successfully detected the road lane. Now i want to steer the car according to the lanes. Mean i wish that car must remain between the road lines. but how i will guide the car motors to stay in between the road lines according to the image. please guide me

The tricky part will be determining your position on the road. But since you said after image processing, it will be the same as a line following robot.
You should be able to find lots of software and hardware examples for line following robots.

Line following robots not normally image recognition, they are simple
reflective measurement opto/led/laser illuminated approaches.

The IEEE did a lot of papers and paper collection books on image recognition,
on issues like edge detection, and more complex objects. I am sure there must
be more lit on the topic on the web by searching.

Simplistically, if you can detect the road lanes, you can compare the current position to a theoretical desired center position.
This could be as simple as a subtraction: (current position - desired position = error signal) the error output would be a positive or negative number. (too far left, or too far right) This error signal would be sent to a motor actuator via serial port, DAC, TCPIP or ANY OTHER output mechanism.

The motor controller must then convert the error signal into a command position for the motor / actuator, to move the steering to the desired angle.

When it's working, the system corrects the error to zero - i.e. car too far left, then steer right.

When the error is zero, the car steers straight ahead, in the center of the lane.

This is a horrendous oversimplification, but at the core, it's really what happens.

sorry for one more thing.
can i use Robot operating system (ROS) for self drive car? is it feasible?
and one more question can i use laptop inside the car for controlling the over all operations.? please suggest. thank you